The vanadium-titanium magnetite concentrate from Panxi region of China was pretreated by high pressure roller grinding( HPRG) and then used in pelletization. Size distribution change of the vanadiumtitanium magnetit...The vanadium-titanium magnetite concentrate from Panxi region of China was pretreated by high pressure roller grinding( HPRG) and then used in pelletization. Size distribution change of the vanadiumtitanium magnetite concentrate after HPRG and the improvement of its green pellet strength were investigated. The results indicated that,besides the increase of fine particles,the vanadium-titanium magnetite concentrate after HPRG had a smaller size ratio of fine particle to coarse particle of 0. 126,meaning a lower porosity,compared with the size ratio of raw material of 0. 157. The concentrate particles were more closely packed when there was a smaller size ratio of fine particle to coarse particle. The particle packing in the green pellets was closer after HPRG,which strengthened the green pellets with an average drop number of 5. 1( drop height of 0. 5 m) and average compressive strength of 13. 1 N per pellet of 11 mm in diameter.展开更多
通过在球团中添加高镁粉,研究了MgO质量分数对熔剂性球团矿强度的影响.结果表明,高镁粉和石灰粉的孔容相对较小,分别为0.052,0.006 cm 3/g,较致密,适宜作为造球用添加剂.随着MgO质量分数由1.6%增加到2.4%,生球落下强度变化不明显,抗压...通过在球团中添加高镁粉,研究了MgO质量分数对熔剂性球团矿强度的影响.结果表明,高镁粉和石灰粉的孔容相对较小,分别为0.052,0.006 cm 3/g,较致密,适宜作为造球用添加剂.随着MgO质量分数由1.6%增加到2.4%,生球落下强度变化不明显,抗压强度先增大后降低;熟球抗压强度呈先增大后降低的趋势.当球团矿中MgO质量分数为2.0%、冷却速率为15℃/min、焙烧温度为1250℃时,球团矿抗压强度最大,最大值为3533 N.展开更多
文摘The vanadium-titanium magnetite concentrate from Panxi region of China was pretreated by high pressure roller grinding( HPRG) and then used in pelletization. Size distribution change of the vanadiumtitanium magnetite concentrate after HPRG and the improvement of its green pellet strength were investigated. The results indicated that,besides the increase of fine particles,the vanadium-titanium magnetite concentrate after HPRG had a smaller size ratio of fine particle to coarse particle of 0. 126,meaning a lower porosity,compared with the size ratio of raw material of 0. 157. The concentrate particles were more closely packed when there was a smaller size ratio of fine particle to coarse particle. The particle packing in the green pellets was closer after HPRG,which strengthened the green pellets with an average drop number of 5. 1( drop height of 0. 5 m) and average compressive strength of 13. 1 N per pellet of 11 mm in diameter.
文摘通过在球团中添加高镁粉,研究了MgO质量分数对熔剂性球团矿强度的影响.结果表明,高镁粉和石灰粉的孔容相对较小,分别为0.052,0.006 cm 3/g,较致密,适宜作为造球用添加剂.随着MgO质量分数由1.6%增加到2.4%,生球落下强度变化不明显,抗压强度先增大后降低;熟球抗压强度呈先增大后降低的趋势.当球团矿中MgO质量分数为2.0%、冷却速率为15℃/min、焙烧温度为1250℃时,球团矿抗压强度最大,最大值为3533 N.